Chris, John,

I understand about the damping of the arm on the AS-1.
Later I put up some pix on my website to illustrate, this.

If I depress the arm say 3/4" on my sensor, the arm will return to zero
position overshoot about 1/2 cycle and return to rest at zero.
However the suspension spring rings, resonates at a rate of a few hertz,
imparting its resonance on top of the  4 sec period of the sensor.

This is what I need to stop.

If the suspension spring on the AS-1 is plucked does it not vibrate at some
frequency and impart that noise into the machine??

PaulC


  -----Original Message-----
  From: psn-l-request@.............. [mailto:psn-l-request@.................
Behalf Of ChrisAtUpw@.......
  Sent: Monday, July 23, 2007 3:43 PM
  To: psn-l@..............
  Subject: Re: Spring Damping.


  In a message dated 2007/07/23, Paulc@........ writes:


    I just finished up a  vertical  sensor with an AS-1 like suspension.
    After looking at the AS-1 pictures, and reading about it, I cannot see
any information about the damping of the suspension spring.


  Hi Paul,

         You don't try to damp the spring itself, but you do damp the arm.
For suggestions see
http://jclahr.com/science/psn/chapman/as1%20damping/index.html
         It can be an advantage to mount the damping blade close to the
mass. This system is very flexible. You just slide the magnet fixture
further over the damping blade until you get the correct damping. I have
tried 1/16" Al sheet for the blade glued to SS threaded rod with two part
acrylic glue. It works OK, but it is not so effective.

         Regards,

         Chris Chapman





Chris,=20
John,
 
I=20
understand about the damping of the arm on the AS-1.
Later=20
I put up some pix on my website to illustrate, this.
 
If I=20
depress the arm say 3/4" on my sensor, the arm will return to zero =
position=20
overshoot about 1/2 cycle and return to rest at =
zero.
However the suspension spring rings, resonates at a rate of a =
few hertz,=20
imparting its resonance on top of the  4 sec period of the sensor.
 
This=20
is what I need to stop.
 
If the=20
suspension spring on the AS-1 is plucked does it not vibrate at =
some=20
frequency and impart that noise into the machine??
 
PaulC
 
 

  
-----Original Message-----
From: =
psn-l-request@.................
  [mailto:psn-l-request@...............On Behalf Of=20
  ChrisAtUpw@.......
Sent: Monday, July 23, 2007 3:43=20
  PM
To: psn-l@..............
Subject: Re: Spring=20
  Damping.

In a message dated 2007/07/23, Paulc@...........
  writes:


  I just finished up a  vertical  sensor with an =
AS-1=20
    like suspension.
After looking at the AS-1 pictures, and reading =
about it, I=20
    cannot see any information about the damping of the suspension=20
    spring.


Hi=20
  Paul,

       You don't try to =
damp the=20
  spring itself, but you do damp the arm. For suggestions see=20
  =
http://jclahr.com/science/psn/chapman/as1%20damping/index.html
 &=
nbsp;    =20
  It can be an advantage to mount the damping blade close to the mass. =
This=20
  system is very flexible. You just slide the magnet fixture further =
over the=20
  damping blade until you get the correct damping. I have tried 1/16" Al =
sheet=20
  for the blade glued to SS threaded rod with two part acrylic glue. It =
works=20
  OK, but it is not so effective. =


      =20
  Regards,

       Chris =
Chapman=20